Delta One vs United Polaris: Which Is Better to Europe?

Both are American, both fly the Atlantic in quantity, and most people choosing between them are looking at two very similar-looking business fares. Here is what the verified cabin data says.

The scores

Carrier and aircraft	Seat	Screens	Lounge	Product
Delta — A350 / A330-900 (Delta One Suite)	10/10	10/10	10/10	8.8
Delta — 767-300ER	8/10	10/10	10/10	8.3
United — 777 / 787 (Polaris)	8/10	8/10	10/10	7.8

Delta wins on product, 8.8 to 7.8. It takes seat 10 to 8 and screens 10 to 8; lounge entitlement and fare value tie.

The seat margin is one specific thing: the Delta One Suite has a closing privacy door, and Polaris does not. Both are lie-flat with direct aisle access from every seat, which is the part that actually decides whether you sleep. The door is real and it is nice. It is not eight hours of sleep versus none.

The more useful difference is variance

Look at the rows again, because the headline number hides the thing you can act on.

Delta's range is 8.8 to 8.3. United's is 7.8 to 7.8.

United flies a consistent Polaris product across both the 777 and the 787 we have verified. Delta does not: the A350 and A330-900 carry the Suite, and the 767-300ER scores 8 on seat instead of 10 because it has no door.

So the honest framing is not "Delta is better." It is Delta is better if you get the right aircraft, and United is the same every time. If you are booking far ahead, or on a route where equipment swaps are common, that predictability is worth something the average score does not capture.

Our best airlines analysis found this pattern across the whole set: seven of fifteen carriers fly materially different cabins on different aircraft at the same fare, and it is the single most under-reported variable in transatlantic business class.

Which is cheaper

An earlier version of this page said we could not answer this. Our carrier grid held 22 routes, Delta and United had not been quoted on a single shared city pair, and rather than invent a comparison we left the section empty and said why.

Completing the grid — first to 59 routes, then to 193 — filled it. The two carriers now overlap on 18:

Route	Delta	United	Cheaper	Cheapest carrier on the route
MCO → Munich	$1,952	$862	United by $1,090	Icelandair $703
MCO → Frankfurt	$1,963	$1,280	United by $683	Icelandair $714
MCO → Madrid	$1,311	$860	United by $451	Air Canada $859
LAX → Lisbon	$1,237	$796	United by $441	Royal Air Maroc $621
MCO → Rome	$1,141	$786	United by $355	United $786
MCO → Porto	$758	$1,330	Delta by $572	Delta $758
LAX → Edinburgh	$963	$1,318	Delta by $355	SAS $902
MCO → Paris	$813	$1,116	Delta by $303	Icelandair $680
LAX → Barcelona	$753	$916	Delta by $163	Royal Air Maroc $564
BOS → Dublin	$642	$632	United by $10	TAP Air Portugal $610

Ten of the eighteen shown above; the full set is in the grid.

United was cheaper on ten, Delta on eight, and the gaps run from $10 to $1,090 in both directions. There is no cheaper airline here. There is a cheaper airline on your route, and it changes route to route on the same day — sometimes by a rounding error, sometimes by four figures.

The last column is the part worth keeping. On 14 of the 18, neither of them was the cheapest carrier on the pair. Icelandair, Royal Air Maroc, TAP, SAS, Air Canada and American all beat them. Between them, across 18 shared routes, Delta and United win four.

Half the overlaps are from Orlando, which is not a coincidence: it is the gateway where neither carrier has a fortress hub, so both are selling connections and both have to price them. Where either airline owns the airport, the other tends not to appear at all.

That the section exists at all is worth stating plainly, because the previous version's honesty is what made this possible: the gap was recorded as a gap rather than filled with a guess, so completing the collection closed it instead of contradicting it.

Across the whole grid, the wider pattern still holds — forty-four of fifty-one flag-carrier home routes were beaten by another airline flying the same city in the same week.

What the lounge tie actually means

Both carriers score 10 out of 10 on "Lounge & bags", and that number is easy to misread, so here is exactly what it counts.

The dimension is a threshold, not a quality rating. Five points for lounge access being included in the fare, up to three for checked bags, two for a carry-on. A 10 means the fare includes lounge entry, two checked bags and a carry-on — it says nothing whatsoever about whether the lounge is any good.

That is deliberate. Lounge quality varies by airport far more than by airline, which is why our rubric scores the lounge you get at your US departure airport rather than the airline's flagship at its home hub, and why a number that tried to capture "how nice is it" would be worthless across a network. Every business cabin in our data scores 10 here except one, so in practice this dimension separates almost nobody — it exists to catch a fare that strips the entitlements out, not to rank the coffee.

If lounge quality matters to you, it is a per-airport question and not a per-airline one.

Booking either one on points

Almost nobody pays cash for a transatlantic business seat, and the two carriers are reached by completely different routes.

To book	Transfer	Ratio	Europe score
Delta One	Amex Membership Rewards → Virgin Atlantic	1:1	88
Delta One	Chase Ultimate Rewards → Virgin Atlantic	1:1	84
Delta One	Citi ThankYou → Virgin Atlantic	1:1	82
United Polaris	Chase Ultimate Rewards → Aeroplan	1:1	86
United Polaris	Chase Ultimate Rewards → United MileagePlus	1:1	62

Amex to Virgin Atlantic, then booking Delta One as a partner award, is the single strongest transfer route in our set at 88 of 100. That is worth knowing before you decide on product: the better cabin is also the easier one to reach with transferable points, which is not usually how these things line up.

United is reached best through Chase to Aeroplan at 86, which is a Star Alliance play rather than a United one — it books Lufthansa, SWISS and Austrian as readily as Polaris, and does it without the fuel surcharges that make Avios awards disappointing. Transferring Chase straight into MileagePlus scores only 62, and is a fallback for when Aeroplan shows nothing.

One rule that applies to all five rows: transfer only after you have found the seat. These are one-way and irreversible, and moving points speculatively converts a flexible currency into an inflexible one for nothing. The points guide works out what an award has to beat before it is worth doing at all.

Which to book

• If you can see the aircraft and it is an A350 or A330-900 — take Delta. The Suite is the best seat either airline flies to Europe.
• If you cannot see the aircraft, or the fare is close — United. A guaranteed 7.8 beats a coin flip between 8.8 and 8.3 for most people, and Polaris is a genuinely good seat.
• If the Delta fare is materially higher — it is not worth a large premium. The gap between these two cabins is a door and a slightly better screen, not a different class of travel.

Both carriers are on our flown roster in business on a Europe route. This page still scores only the four dimensions that can be verified without being on the aircraft, because that is what makes two carriers comparable at all — service and food are scored only inside a full review of one cabin, like our Azores Airlines review.

Where to go from here

• The best airlines to Europe — all fifteen carriers on the same rubric.
• British Airways vs Virgin Atlantic — the transatlantic pair where every dimension ties.
• Flying to Europe with points — what a business award has to beat, since most people are not paying cash for these.
• How we review — why only four of seven dimensions are scored here.